T-Shirt Quilt & how do I clean my iron????????

There was an unexpected result from all the ironing on of interfacing. I used three pressing cloths. The interfacing NEVER touched the iron. The t-shirts and their respective designs were never touched by the iron.

Is this iron/minerals from my water????? I have never had this happen before. I have been ironing since I was a child and I am now 62. Guess there is a first time for everything. This is a $$$ Rowenta Iron. It has a stainless steel plate. So what happened????
Maybe the more important question is: How do I remove this?
I tried running the iron over a dryer sheet. It smelled good but nothing happened.

Sarah Martin had the tip that worked for me and my poor iron!! See below!!

I wrote back to her:
Sarah,

It came off with the white vinegar!

You are fantastic!

I am thinking there must have been starch on the muslin pieces I was using as pressing cloths. They were cut offs from backings. I did not use any starch today but it must have been on the pressing cloths.

You are one fantastic lady!

Thanks so very much.

I owe you something for that great tip.

 I bought a 40 yard bolt of Pellon 911FF interfacing. I used a 50% off coupon and with free shipping the entire bolt cost less than buying 20 yards at retail price at Joann's.com. I am so glad I did buy the whole bolt because I used gobs of it making these t-shirt squares stable. And the bolt end said no pre-shrinking needed. And it was right. I did do some research on the internet and some have had wrinkle issues with using this technique'. I did a sample and it does not ripple, shrink or distort. WHOOHOOO!! So I pressed away and have a great size stack of t-shirt squares.

 I stabilized some blank squares to add some embroidery if I need more units to make whatever quilt size this is going to end up being. Right now I do not know.

These shirts belonged to my former son-in-law who passed away last year. He was a Police Detective and a  great father to my Grand daughter Arika. It was very hard to cut in to his shirts. But it was also a labor of love and respect. This quilt will be much loved no matter how it turns out.

 Yesterday I had some retail therapy. I attended a Gathering of Quilters. The speaker was Edyta Sitar owner and co-founder of Laundry Basket Quilts. All I can say about her is WOW! She uses all the colors I love. And has some great books and fabric for sale.
I can feel the urges of becoming a fan of hers as I am of Our Bonnie Hunter. But I do not know if I can afford to be in love with two quilt designers at the same time. HA!

 I bought this quilt kit for GD Zoey. She loves purple and loves cats. Her BD is late in November so I have plenty of time. And she also has this LOVE of Minkee. I found a pre-cut hunk of purple Minkee and bought that too! And the wooden sign that says "Quilting Queen".

 I did not need but had to have this group of fabrics. Brownish/pinkish gorgeous fabrics with a pattern called Radiant.
I left the quilt show after I could no comfortably longer carry everything I had bought.
HA! Time to go home!

 And some more pink and gray fabrics that I did not own...what can I say?
And some Civil War fabrics. After Edyta's lecture I was on a tan/brown high and had to get some fabrics. She mixes batiks with regular cottons. The same as I do. They do play well together.

I also bought this quilt kit for newest GG child due in September. BUT...the panel was NOT in the kit! ARGGGGGGGGGGGGG!!!! I did call the seller after I got home and was touching all my purchases but had to leave a voice mail. Darn it! I guess I should have looked through the sealed bag before I left. But who woulda' thunk???? It may be a blessing in design. But dog gone it!!!!!

XOXOXOOX Subee